Birds of a feather drink together: The three clever pigeons who help each other sup from a water fountain

"After waiting for the fountain to be free, one bird jumped on the lever and pushed it down to fill up the bowl, while another kept watch and the third splashed in..." http://www.dailymail.co.uk/news/worldnews/article-1206608/Birds-feather-drink-The-pigeons-help-sup-water-fountain.html?ITO=1490